In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
protection and papi provides 4 ** statute miles ** of protection.

True or False

Stan

wrote:
> In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
> protection and papi provides 4 ** statute miles ** of protection.
>
> True or False
>
> Stan
True

In article >,
wrote:

> In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
> protection and papi provides 4 ** statute miles ** of protection.
>
> True or False
>
> Stan

This is the kind of question that gives FAA knowledge tests a bad name.

On 2005-12-27, Roy Smith > wrote:
>In article >,
wrote:
>>
>> In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
>> protection and papi provides 4 ** statute miles ** of protection.
>
> This is the kind of question that gives FAA knowledge tests a bad name.

I don't think it's *on* the written because I've never heard that before.
I didn't even realize that a vasi/papi had a specific clearance requirement.
What about private airports that just throw up a few boards?


--
Ben Jackson
>
http://www.ben.com/

Ben Jackson wrote:
> On 2005-12-27, Roy Smith > wrote:
>
>>In article >,
wrote:
>>
>>>In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
>>>protection and papi provides 4 ** statute miles ** of protection.
>>
>>This is the kind of question that gives FAA knowledge tests a bad name.
>
>
> I don't think it's *on* the written because I've never heard that before.
> I didn't even realize that a vasi/papi had a specific clearance requirement.
> What about private airports that just throw up a few boards?
>
>
They had better not "throw up a few boards" in disregard of FAA airport
standards. If they do, it might be some hungry attornies coming after
them someday, rather than the FAA.

Here is what the AIM says:

2-1-2. Visual Glideslope Indicators
a. Visual Approach Slope Indicator (VASI)
1. The VASI is a system of lights so arranged to provide visual descent
guidance information during the approach to a runway. These lights are
visible from 3-5 miles during the day and up to 20 miles or more at
night. The visual glide path of the VASI provides safe obstruction
clearance within plus or minus 10 degrees of the extended runway
centerline and to 4 NM from the runway threshold. Descent, using the
VASI, should not be initiated until the aircraft is visually aligned
with the runway. Lateral course guidance is provided by the runway or
runway lights.

What the AIM misses is that PAPIs are good to 4 statute miles because of
a different Airports advisory circular for airport owners. I doubt the
1/2 mile difference would ever be critical.

What is critical is to check the AFD to make certain that a VASI or PAPI
is not further restricted.

> wrote in message
...
>
> In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
> protection and papi provides 4 ** statute miles ** of protection.
>
> True or False
>

False

Steven P. McNicoll wrote:

> > wrote in message
> ...
>
>>In the US, vasis provides a maximum of 4 ** nautical miles ** obstacle
>>protection and papi provides 4 ** statute miles ** of protection.
>>
>>True or False
>>
>
>
> False
>
>
Check alt.binaries.pictures.aviation for a PDF I just uploaded, which
shows that VASI extends to 4 n.m. and PAPI to 4 s.m.

Note the fax date on the order, which was sent to me by the FAA in early
2004. This order was in effect for at least 23 years.

The best I can determine, this order quietly disappeared sometime in
mid-2004, making the siting for any *new* PAPI installations 4 nautical
miles, the same as VASI.

So, any PAPIs installed since mid-2004 are, or should be, 4 n.m. The
vast majority, however, have not been resurveyed (a airport authority,
not FAA, responsibility).

Thanks Tim. Helpful as always
Stan
>Check alt.binaries.pictures.aviation for a PDF I just uploaded, which
>shows that VASI extends to 4 n.m. and PAPI to 4 s.m.
>
>Note the fax date on the order, which was sent to me by the FAA in early
>2004. This order was in effect for at least 23 years.
>
>The best I can determine, this order quietly disappeared sometime in
>mid-2004, making the siting for any *new* PAPI installations 4 nautical
>miles, the same as VASI.
>
>So, any PAPIs installed since mid-2004 are, or should be, 4 n.m. The
>vast majority, however, have not been resurveyed (a airport authority,
>not FAA, responsibility).